Is there a difference?

Unless you believe that Satan is made up of hydrogen and helium, they ARE metal. But maybe your mythos believes that Satan is a star / constellation, I dunno.

Many of the constellations (collections of stars) were though to be embodiments of deities in many belief systems across the world, from the Greeks and Romans in Europe to the indigenous peoples of Australia! It wouldn't surprise me if Satan is thought to be made of star stuff in some mythos.